Add an experimental interface for customizing DCE behavior. #25956
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We use dead code elimination (DCE) throughout JAX core to remove unused computations from Jaxprs. This typically works transparently when we're just using `lax` primitives, but opaque calls to `pallas_call` or `ffi_call` can't be cleaned up this way. For many kernels however, the author will know how to generate a more efficient call for specific patterns of used outputs, so it is useful to provide a mechanism for customizing this behavior. In #22735, I attempted to automatically tackle one specific example of this that comes up frequently, but there have been feature requests for a more general API. This version is bare bones and probably rough around the edges, but it could be a useful starting point for iteration. PiperOrigin-RevId: 716596154
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Add an experimental interface for customizing DCE behavior.
We use dead code elimination (DCE) throughout JAX core to remove unused computations from Jaxprs. This typically works transparently when we're just using
laxprimitives, but opaque calls topallas_callorffi_callcan't be cleaned up this way. For many kernels however, the author will know how to generate a more efficient call for specific patterns of used outputs, so it is useful to provide a mechanism for customizing this behavior.In #22735, I attempted to automatically tackle one specific example of this that comes up frequently, but there have been feature requests for a more general API. This version is bare bones and probably rough around the edges, but it could be a useful starting point for iteration.